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Geosynte& <br /> consultants <br /> TABLE OF CONTENTS <br /> 1. INTRODUCTION....................................................................................................................1 <br /> 1.1 UST 817B Background...................................................................................................1 <br /> 1.2 Summary of Previous Environmental Investigations......................................................2 <br /> 1.3 Site Geology &Hydrogeology........................................................................................4 <br /> 2. INVESTIGATION OBJECTIVES AND APPROACH...........................................................4 <br /> 3. SUMMARY OF INVESTIGATION ACTIVITIES.................................................................5 <br /> 4. INVESTIGATION WORK PLAN...........................................................................................6 <br /> 4.1 Pre-field Activities ..........................................................................................................6 <br /> 4.2 Field Activities................................................................................................................6 <br /> 4.2.1 Soil Sampling......................................................................................................7 <br /> 4.2.2 Grab Groundwater Sampling...............................................................................7 <br /> 4.2.3 Groundwater Monitoring Well Sampling............................................................8 <br /> 4.2.4 Soil Vapor Probe Installation..............................................................................8 <br /> 4.2.5 Soil Vapor Sampling...........................................................................................9 <br /> 4.2.6 Sample Labeling, Handling, and Analysis........................................................10 <br /> 4.2.7 Equipment Decontamination Procedures..........................................................12 <br /> 4.2.8 Investigation-Derived Waste.............................................................................12 <br /> 4.2.9 Site Restoration.................................................................................................13 <br /> 4.3 Quality Control Samples...............................................................................................13 <br /> 4.3.1 Trip Blanks........................................................................................................13 <br /> 4.3.2 Field Blanks.......................................................................................................13 <br /> 4.3.3 Field Duplicate Samples....................................................................................13 <br /> 4.3.4 Equipment Blanks .............................................................................................14 <br /> 4.4 Data Validation..............................................................................................................14 <br /> 5. REPORTING AND SCHEDULE ..........................................................................................14 <br /> 6. REFERENCES.......................................................................................................................16 <br /> Investigation Work Plan—UST 817B ii December 2024 <br />